<input name="example1_option" value="1" type="radio" checked="checked" ng-model="example1_option"/>
<label>option1</label>
<input name="example1_option" value="2" type="radio" ng-model="example1_option"/>
<label>option2</label>
<div class="content">
    <p ng-show="example1_option == 1">
        option 1 content
    </p>
    <p ng-show="example1_option == 2">
        option 2 content
    </p>
</div>